Systemic acquired resistance (SAR) is a plant defense mechanism that provides long-lasting protection against a wide array of pathogens after an initial localized exposure. When a plant detects an infection, it triggers a signal that induces resistance not just in the infected area but throughout the entire plant. This enhanced state of readiness allows the plant to respond more effectively to subsequent infections, including those caused by nematodes and insects.
congrats on reading the definition of systemic acquired resistance. now let's actually learn it.